QUOTE(kg6dxn @ Oct 23 2010, 04:47 PM)

The front left turn signal housing is wired wrong. you system is pulling its ground through the head light circuit. Possibly the front left signal ground is broken

Remove the turn signal lense and make sure just the bright filament is on when the turn signal is on. This will confirm the issue. Also with the parking light on, just the dim filament should be lit.